Toner Pigments

A magnetic brush development system serves for the transportation of the toner powder. In a Dual Component System a rotating bar magnet is covered with a magnetizable ferrite powder, the so-called carrier (component 1), giving it the appearance of a brush. The carrier is dipped into a bath of toner powder (component 2) and 

Laser printers and many copiers work by the one-component process, which allows the design of particularly compact machines. The principle of the magnetic brush is retained, however, the toner itself is magnetizable. This can be done by dispersing ca. 30-50 wt.% of black, magnetizable iron oxide particles in thermoplastic resins. Apart from the iron oxide, various additives are generally also incorporated to control the electrostatic chargeability, the flow characteristics and the color. The particle size of these toners is ca. 5-15 pm. 

Black magnetite pigments are typically produced either by precipitation from iron salt solutions or by the Laux process. The production processes are described in detail in Section 3.1.1 (Table 3.2, especially Eqs. (3.10), (3.11) and (3.12)). 

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Lakes are either dry toner pigments that are extended with a soHd diluent, or an organic pigment obtained by precipitation of a water-soluble dye, frequendy a sulfonic acid, by an inorganic cation or an inorganic substrate such as aluminum hydrate. 

Another important class of pigment are the so-called toner pigments. These are water-soluble dyes containing sulfonic acid groups which are insolubilized by forming a salt with a divalent cation such as calcium and barium5 (Scheme 2). Until recently the toner pigments were perceived merely as insoluble salts but X-ray studies have shown them to exist as supramolecular metal complexes (see Section 9.12.4.2). 

Azo toner pigments provide the standard worldwide process magenta colorants for printing inks. Cl Pigment Red 57 1 (33), known as Calcium 4B toner, is one of the most important. These pigments were considered as insoluble calcium (or barium) salts of the sulfonated azo dye... 

Use Intermediate for azo pigments, toner pigment in printing inks, corrosion inhibitor. 

Phthalic anhydride Phthalocyanine toners Pigment scarlet lake... 

Thixatrol ST Tixogel VP toner, pigment Hgh-solids coatings... 

Uses Intermediate for azo pigments toner pigment in printing inks corrosion inhibitor Manuf./Distrib. AccuStandard http //www.accustandard.com, Acros Org. http //www.acros.be, Aldrich http //www.sigma-aldrich.com, Alfa Aesar http //www.alfa.com, Biddle Sawyer http //www.biddlesawyer.com Fluka http //www.sigma-aidrich.com, ICN Biomed. Research Prods. http //www.icnbiomed.com, Lancaster Synthesis Pfaltz Bauer http //www.pfaitzandbauer. com] Riedel-deHaSn http //WWW. rdh-iab. de... 

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